<s>
The	O
most	O
common	O
microphone	B-Algorithm
connector	I-Algorithm
in	O
consumer	O
use	O
is	O
the	O
venerable	O
phone	B-Device
connector	I-Device
,	O
in	O
1/4	O
"	O
(	O
6.35mm	O
)	O
,	O
3.5mm	O
,	O
and	O
2.5mm	O
sizes	O
,	O
and	O
in	O
both	O
mono	O
and	O
stereo	O
configurations	O
.	O
</s>
<s>
Not	O
all	O
microphone	B-Device
plugs	I-Device
with	O
3-segment	O
TRS	O
(	O
Tip-Ring-Sleeve	B-Device
)	O
connectors	O
are	O
actually	O
stereo	O
.	O
</s>
<s>
see	O
:	O
The	O
3	O
connectors	O
on	O
the	O
left	O
are	O
1934	O
type	O
"	O
P	O
"	O
round	O
microphone	B-Algorithm
connectors	I-Algorithm
.	O
</s>
<s>
Popular	O
microphone	B-Algorithm
connector	I-Algorithm
from	O
1930s	O
to	O
1980s	O
,	O
originally	O
manufactured	O
by	O
Amphenol	O
.	O
</s>
<s>
The	O
Amphenol	O
80-MC2M	O
,	O
which	O
mates	O
with	O
the	O
80-PC2F	O
,	O
microphone	B-Algorithm
connector	I-Algorithm
was	O
popular	O
with	O
American	O
radio	O
manufacturers	O
(	O
1950s	O
to	O
1970s	O
)	O
.	O
</s>
<s>
Most	O
commonly	O
used	O
on	O
professional	O
microphones	O
,	O
the	O
common	O
3-pin	O
XLR	B-Device
connector	I-Device
is	O
a	O
standard	O
for	O
transferring	O
balanced	B-Protocol
audio	I-Protocol
among	O
professional	O
audio	O
equipment	O
.	O
</s>
<s>
The	O
4-pin	O
XLR	B-Device
connector	I-Device
is	O
also	O
commonly	O
used	O
on	O
amateur	O
radio	O
microphones	O
,	O
but	O
transferring	O
unbalanced	O
audio	O
instead	O
,	O
and	O
using	O
the	O
4th	O
pin	O
(	O
with	O
the	O
common	O
ground	O
)	O
for	O
a	O
push-to-talk	O
(	O
PTT	O
)	O
circuit	O
activated	O
by	O
a	O
button	O
on	O
the	O
microphone	O
.	O
</s>
<s>
First	O
used	O
in	O
the	O
1970s	O
by	O
Japanese	O
radio	O
manufacturers	O
as	O
an	O
alternative	O
to	O
the	O
German	O
DIN	B-Architecture
connector	I-Architecture
standard	O
for	O
microphone	B-Algorithm
connectors	I-Algorithm
on	O
citizens	B-Application
band	I-Application
and	O
amateur	O
radio	O
equipment	O
,	O
these	O
screw-on	O
circular	O
connectors	O
are	O
available	O
with	O
2	O
,	O
3	O
,	O
4	O
,	O
5	O
,	O
6	O
,	O
7	O
,	O
or	O
8	O
pins	O
.	O
</s>
<s>
These	O
connectors	O
are	O
sold	O
under	O
a	O
variety	O
of	O
generic	O
names	O
:	O
CB	O
connector	O
,	O
mobile	O
connector	O
,	O
microphone	B-Algorithm
connector	I-Algorithm
,	O
power	O
connector	O
.	O
</s>
<s>
Sometimes	O
they	O
are	O
misidentified	O
as	O
XLR	B-Device
connectors	I-Device
.	O
</s>
<s>
Although	O
originally	O
designed	O
for	O
telephone	O
usage	O
and	O
later	O
adopted	O
for	O
computer	O
networking	O
,	O
the	O
modular	B-Architecture
connector	I-Architecture
has	O
been	O
used	O
for	O
microphone	O
connections	O
extensively	O
on	O
modern	O
amateur	O
radio	O
equipment	O
,	O
including	O
models	O
from	O
the	O
three	O
major	O
manufacturers	O
(	O
Icom	O
,	O
Kenwood	O
,	O
and	O
Yaesu	O
)	O
,	O
but	O
primarily	O
used	O
on	O
mobile	O
radio	O
equipment	O
(	O
designed	O
to	O
be	O
mounted	O
in	O
vehicles	O
)	O
.	O
</s>
<s>
Like	O
the	O
screw-on	O
round	O
microphone	B-Algorithm
connectors	I-Algorithm
,	O
there	O
is	O
little	O
standardization	O
among	O
manufacturers	O
,	O
and	O
even	O
among	O
different	O
models	O
from	O
the	O
same	O
manufacturer	O
,	O
leading	O
to	O
significant	O
interoperability	O
problems	O
when	O
connecting	O
non-OEM	O
or	O
homebrew	O
microphones	O
and	O
other	O
equipment	O
.	O
</s>
<s>
Most	O
radios	O
with	O
modular	O
microphone	B-Algorithm
connectors	I-Algorithm
use	O
the	O
8P8C	O
(	O
vernacular	O
:	O
RJ45	O
)	O
connector	O
,	O
but	O
some	O
use	O
6P6C	O
or	O
4P4C	O
connectors	O
.	O
</s>
